Right picked up the reply this morning so will have a go with that later today, see if I restore the Air ride back to normal and away from this BMW like feel
Turns out the additional parts suggested for puchase with the compressor is the relay anyway nothing else! Just £1084 even charge 2% extra to use the credit card, I am in the wrong business
Whilst in the dealers I enquired about the fitting of a new compressor if this relay doesn't do the trick just for an idea of not getting dirty
... quote was between 350 and 400
They then went on to say that it needs to be set up and calibrated using the laptop.
Mind you they said that about the AMI unit too
Will report in later
Cheers